US9828680B2 - Method for operating a bearing arrangement - Google Patents

Method for operating a bearing arrangement Download PDF

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Publication number
US9828680B2
US9828680B2 US14/912,688 US201414912688A US9828680B2 US 9828680 B2 US9828680 B2 US 9828680B2 US 201414912688 A US201414912688 A US 201414912688A US 9828680 B2 US9828680 B2 US 9828680B2
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United States
Prior art keywords
bearing
roller bearing
roller
bearing part
cathode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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US14/912,688
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English (en)
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US20160201202A1 (en
Inventor
Matthias Goß
Walter Holweger
Marcus Wolf
Toni Blaß
Holger Kaup
Jorg Loos
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Schaeffler Technologies AG and Co KG
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Schaeffler Technologies AG and Co KG
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Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLAß, Toni, GOSS, MATTHIAS, HOLWEGER, WALTER, KAUP, HOLGER, LOOS, JORG, WOLF, MARCUS
Publication of US20160201202A1 publication Critical patent/US20160201202A1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/005—Anodic protection
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such

Definitions

  • the invention relates to a method for operating a bearing arrangement comprising at least one roller bearing, wherein an electrical voltage is applied to at least one bearing part of the roller bearing, in particular, to a bearing ring.
  • a bearing with a corrosion-protected bearing part wherein the corrosion protection is achieved with the help of an external power source.
  • a bearing part namely a bearing ring of a roller bearing, is connected as a cathode of the external power supply.
  • the associated anode is arranged opposite the bearing ring and can be constructed as a ring anode.
  • the invention is based on the objective of refining a corrosion protection device operating with a power source for a roller bearing relative to the cited prior art.
  • This objective is achieved according to the invention by a method for operating a bearing arrangement comprising at least one roller bearing.
  • the objective is likewise achieved by a bearing arrangement that comprises a power supply and control unit formed for carrying out the method.
  • a positive electrical potential is applied to a bearing part of the roller bearing to be protected, while another part of the bearing arrangement is connected as a cathode.
  • the current flowing between the bearing part and the cathode is limited.
  • the limit can be realized in a simple way, for example, by connecting an electrical resistance in advance in series that is significantly larger than the electrical resistance of the roller bearing.
  • Another possibility of limiting the current flowing through the bearing part is to regulate the current.
  • the maximum current density is, in each case, preferably at most 0.13 A/mm 2 with respect to the area of Hertzian contact stress.
  • the invention starts from the idea that various corrosion mechanisms can lead to damage to the roller bearings.
  • a proven method for preventing corrosion on metallic machine parts is cathode corrosion protection.
  • a part to be protected from corrosion in the case of the cited DE 10 2011 017 776 A1, a roller bearing ring, is connected as a cathode.
  • the associated anode is generally also designated as a sacrificial anode and has only one function within the corrosion protection device, but absolutely no mechanical function.
  • a positive electrical potential is applied to a mechanically loaded roller bearing part and thus the roller bearing part is connected as an anode.
  • WEC white etching cracks
  • WEA white etching areas
  • the electrical potential according to the invention in the roller bearing part to be protected ensures that protons are kept away from areas of the roller bearing part at risk of WEC. This positive effect, which effectively counteracts WEC damage, by far outweighs any theoretically conceivable negative effects related to surface corrosion due to the connection of the roller bearing part as an anode.
  • Another effect that is significant for the effectiveness of the method according to the invention is oxidation that is caused by the potential applied to the protected bearing part.
  • Metal oxides are produced by this oxidation, like those also formed in a chemical black process.
  • the oxides that are formed and are abraded again from the workpiece surface during operation of the roller bearing are instead permanent.
  • the connection of the bearing part to be protected as an anode provides permanent protection.
  • a current intensity set with respect to regulation or limited in a simpler electronic way can be, depending on the bearing type, for example, in a range between 200 microamperes and 300 microamperes or in a range between 20 microamperes and a maximum of 25 microamperes.
  • the current flowing through the bearing part to be protected is advantageously set, in particular, regulated, such that it is in an interval in which a voltage-current characteristic curve has a local voltage maximum as a maximum value within the entire interval.
  • a current increase initially corresponds to a relative strong voltage increase.
  • an approximately linear relationship can be given until a local voltage maximum is achieved.
  • current breakdowns occur that are more common at higher current intensities. Due to the accumulation of current breakdowns, the applied voltage decreases in a limited range for increasing current intensities.
  • the current intensity at which the bearing arrangement is operated is preferably at least 20% and at most 400% of the current intensity where the local voltage maximum lies.
  • an electrically conductive part can be used that is either not loaded mechanically or is a mechanically loaded roller bearing part, in particular, a bearing ring.
  • the bearing part connected as a cathode can be either a component of the same roller bearing that also has the bearing part connected as an anode or it can be a component of another roller bearing.
  • a part is used that is made from a different material, namely a material that is less at risk of WEC, than the roller bearing part that is connected as an anode and is at risk of corrosion, in particular, WEC.
  • multiple bearing rings of the same roller bearing are applied to the same positive potential, wherein they function together as an anode within the corrosion protection system.
  • the associated cathode is preferably not a roller bearing part.
  • roller bearing part protected with the method according to the invention can be part of a rotating bearing or part of a linear bearing.
  • combinations of rotating and linear bearings are suitable for the application of the method.
  • the method can be used, for example, in the areas of wind power, steel industry, paper industry, automobile manufacturing, textile industry, and household appliances.
  • the components to be protected from corrosion in roller bearings are, for example, components of transmission bearings or generator bearings.
  • FIG. 1 in a simplified sectional view, a bearing arrangement with electrical corrosion protection system.
  • FIG. 2 in a diagram, the relationship between the electrical current flowing through the bearing arrangement according to FIG. 1 and the applied voltage.
  • the bearing arrangement shown in FIG. 1 and marked overall with the reference symbol 1 is a roller bearing test bed FE8 according to DIN 51819 that was originally designed for testing lubricants.
  • the functionality of the corrosion protection system according to the invention was verified with tests carried out on this test bed.
  • the bearing arrangement 1 can be, for example, a main shaft bearing, a transmission bearing, or a generator bearing of a wind turbine.
  • a roller bearing 2 of the bearing arrangement 1 is formed as an axial bearing arrangement.
  • the roller bearing 2 has two bearing parts 3 , 4 , namely bearing disks of which the bearing disk 3 is connected as an anode and the bearing disk 4 is connected as a cathode of the corrosion protection system.
  • the central electronic component of the corrosion protection system is a power supply and control unit 5 that has connections 6 , 7 to which the bearing disk 3 connected as an anode or the bearing disk 4 connected as a cathode are connected.
  • the bearing disk 4 of the roller bearing 2 is connected to ground, the bearing disk 3 is connected to a positive electrical potential of approximately 5 volts. The exact magnitude of the positive electrical potential, however, is not decisive for the corrosion protection method.
  • this value is between 200 microamperes and 250 microamperes and is thus both large enough that it prevents damage due to corrosion, in particular, WEC damage, on the bearing disk 3 , and is also low enough to reliably rule out damage caused by electrical currents on components of the roller bearing 2 , also roller bodies 8 .
  • the diagram in FIG. 2 shows a voltage-current characteristic curve on which three operating points B 1 , B 2 , B 3 are marked, wherein for each operating point B 1 , B 2 , B 3 , the exact voltage curve measured with an oscilloscope is shown as an example in separate, small diagrams.
  • the voltage U (in volts) plotted in the characteristic curve as a function of current I (in amperes) is to be understood as an effective value.
  • the operating point B 1 is in a region of the characteristic curve in which an approximately linear relationship between the increase of current I and the increase of the effective voltage U can be observed. In time profile, the voltage has no strong fluctuations.
  • the second operating point B 2 corresponds to a local maximum of the voltage-current characteristic curve.
  • the associated time-resolved voltage curve shows that occasional voltage dips occur at this operating point B 2 .
  • Each voltage dip corresponds to a current breakdown, wherein the voltage is then reestablished.
  • continuous voltage dips occur, which means a lower effective voltage in comparison to the operating point B 2 for a simultaneously higher current flow.
  • the bearing arrangement 1 is preferably operated at the second operating point B 2 at which the current intensity I equals approximately 200 ⁇ A. Deviating from this, current intensities are also suitable that are below or above this value as long as the voltage U is reduced by no more than 50% relative to the value present at the local maximum, that is, at the operating point B 2 . In particular, this condition is fulfilled at the operating points B 1 and B 3 .
  • the bearing part 4 connected as a cathode that is, the bearing disk 4 connected to the negative connection 7 of the power supply and control unit 5 , is made from a material that differs from the material of the bearing part 3 protected from corrosion by the power supply and control unit 5 .
  • the bearing part 4 connected as a cathode and also could also be a mechanically unloaded or only slightly loaded part, for example, housing part, of the bearing arrangement 1 .
  • Another method variant provides that both bearing parts 3 , 4 of the roller bearing 2 are set together to the same positive electrical potential, while another part, in particular, housing part, of the bearing arrangement 1 is connected to the connection 7 , that is, to ground.
  • the roller bearing 2 is lubricated either with oil or with grease, in each case, with an electrically non-conductive or only minimally conductive material.
  • changes to the lubrication relationships by the power supply and control unit 5 are detected based on a changed electrical resistance between the bearing parts 3 , 4 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Rolling Contact Bearings (AREA)
  • Motor Or Generator Frames (AREA)
US14/912,688 2013-08-27 2014-07-25 Method for operating a bearing arrangement Expired - Fee Related US9828680B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102013216995.7A DE102013216995B3 (de) 2013-08-27 2013-08-27 Verfahren zum Betrieb einer Lageranordnung
DE102013216995 2013-08-27
DE102013216995.7 2013-08-27
PCT/DE2014/200352 WO2015028010A1 (de) 2013-08-27 2014-07-25 Verfahren zum betrieb einer lageranordnung

Publications (2)

Publication Number Publication Date
US20160201202A1 US20160201202A1 (en) 2016-07-14
US9828680B2 true US9828680B2 (en) 2017-11-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US14/912,688 Expired - Fee Related US9828680B2 (en) 2013-08-27 2014-07-25 Method for operating a bearing arrangement

Country Status (6)

Country Link
US (1) US9828680B2 (de)
EP (1) EP3039170B8 (de)
CN (1) CN105452532B (de)
DE (1) DE102013216995B3 (de)
DK (1) DK3039170T3 (de)
WO (1) WO2015028010A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016209399A1 (de) 2016-05-31 2017-11-30 Schaeffler Technologies AG & Co. KG Lageranordnung

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1047000A (fr) 1951-12-20 1953-12-10 Perfectionnements aux dispositifs de protection électrique contre la corrosion
GB1123595A (en) 1965-06-29 1968-08-14 Sentralinst For Ind Forskning Improvements in or relating to the cathodic corrosion protection of metal bodies
GB1462931A (en) 1973-03-21 1977-01-26 Skarpenord As Propeller shaft in a cathodic protection system for protection of a ships propeller
WO1995006761A1 (en) 1993-09-02 1995-03-09 Stri Ab Device for compensation of an alternating voltage which occurs between a medium and a metallic pipeline disposed in the medium
US6530694B2 (en) * 2000-04-20 2003-03-11 Nsk Ltd. Rolling bearing unit
WO2006053462A1 (fr) 2004-11-19 2006-05-26 Li Zhang Dispositif d'alimentation dynamique et capteur de couple conforme a celui-ci
DE102007055575A1 (de) 2007-11-20 2009-06-04 Ab Skf Laufbahnelement einer Wälzlagerung
WO2009135482A2 (de) 2008-05-08 2009-11-12 Schaeffler Kg Lagermodul
WO2010102646A1 (en) 2009-03-10 2010-09-16 Ab Skf Power supply
US20100316315A1 (en) * 2008-02-22 2010-12-16 Ntn Corporation Member for rolling bearing and rolling bearing
US8240923B2 (en) * 2008-01-15 2012-08-14 The Timken Company X-ray tube rotating anode assembly bearing
DE102011017776A1 (de) 2011-04-29 2012-10-31 Schaeffler Technologies AG & Co. KG Lager mit korrosionsgeschütztem Lagerteil

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1047000A (fr) 1951-12-20 1953-12-10 Perfectionnements aux dispositifs de protection électrique contre la corrosion
GB1123595A (en) 1965-06-29 1968-08-14 Sentralinst For Ind Forskning Improvements in or relating to the cathodic corrosion protection of metal bodies
GB1462931A (en) 1973-03-21 1977-01-26 Skarpenord As Propeller shaft in a cathodic protection system for protection of a ships propeller
WO1995006761A1 (en) 1993-09-02 1995-03-09 Stri Ab Device for compensation of an alternating voltage which occurs between a medium and a metallic pipeline disposed in the medium
US6530694B2 (en) * 2000-04-20 2003-03-11 Nsk Ltd. Rolling bearing unit
WO2006053462A1 (fr) 2004-11-19 2006-05-26 Li Zhang Dispositif d'alimentation dynamique et capteur de couple conforme a celui-ci
DE102007055575A1 (de) 2007-11-20 2009-06-04 Ab Skf Laufbahnelement einer Wälzlagerung
US8240923B2 (en) * 2008-01-15 2012-08-14 The Timken Company X-ray tube rotating anode assembly bearing
US20100316315A1 (en) * 2008-02-22 2010-12-16 Ntn Corporation Member for rolling bearing and rolling bearing
WO2009135482A2 (de) 2008-05-08 2009-11-12 Schaeffler Kg Lagermodul
US20110188794A1 (en) 2008-05-08 2011-08-04 Schaeffler Technologies Gmbh & Co. Kg Bearing module
WO2010102646A1 (en) 2009-03-10 2010-09-16 Ab Skf Power supply
DE102011017776A1 (de) 2011-04-29 2012-10-31 Schaeffler Technologies AG & Co. KG Lager mit korrosionsgeschütztem Lagerteil
US20140044387A1 (en) 2011-04-29 2014-02-13 Schaeffler Technologies AG & Co. KG Bearing comprising a corrosion-resistant bearing part

Also Published As

Publication number Publication date
US20160201202A1 (en) 2016-07-14
CN105452532A (zh) 2016-03-30
EP3039170A1 (de) 2016-07-06
CN105452532B (zh) 2018-07-31
DE102013216995B3 (de) 2015-02-12
WO2015028010A1 (de) 2015-03-05
EP3039170B8 (de) 2021-04-07
EP3039170B1 (de) 2020-12-02
DK3039170T3 (da) 2021-02-01

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